extremely bad service, bad attitude and questionable competency

Brought my grandfather to the bank to enquire about an email sent. Because of his age and lack of understanding when it comes to technology he had to be accompanied so I could explain the problems as he does not fully complain. Before given a chance to state the issue it before I was even greeted I was told to leave and go stand outside. The clerk refused to hear that my grandad could not provide the information she needed on his own. She continued to be rude and refused to listen to the actual problem. I left to stand a distance away and I could hear how she could not even address the issue he was having. Instead she wasted time telling him information we already had from using the app.